The clonal architecture and biomass of Phyllostachys edulisas affected by different management modes

doi:10.3969/j.issn.1000-2006.2015.01.014

ZHU Qianggen, JIN Aiwu, CHEN Cao, WANG Yikun, HUANG Haiyong

Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 2015, Vol. 39 ›› Issue (01) : 73-78.

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Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 2015, Vol. 39 ›› Issue (01) : 73-78. DOI: 10.3969/j.issn.1000-2006.2015.01.014

The clonal architecture and biomass of Phyllostachys edulisas affected by different management modes

ZHU Qianggen¹, JIN Aiwu^1*, CHEN Cao², WANG Yikun¹, HUANG Haiyong³

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Abstract

Clonal plant architecture depends on species-specific constraints, but also respond of morphological plasticity to extrinsic environmental factors or disturbance. This was well investigated in clonal grass, but little was known in giant clone specie such as Phyllostachys edulis. Our objectives were to study the effects of different management modes on clonal architecture of Ph. edulis, and ramets and rhizome biomass were also discussed. Three management modes were chosen to investigate clonal rhizome fragments and architectural traits such as length of rhizome or internodes, branching intensity or angles, number of nodes and rhizome diameter. These modes had differences in level of rhizome severing(rhizome severing or rhizome severing terminals)and fertilization and soil heterogeneity, and represented shoot(new ramet)food harvesting mode(SFH), stem harvesting mode(SH)and mixed mode with the two types(MM)by main use of forest land, respectively. Biomasses allocated to ramets or rhizomes were also investigated in three management modes. Results showed that branching intensity of rhizome significantly differed in different management modes(P<0.05), as indicated SFH>MM>SH, which was consistent with high, middle and low level of rhizome severing. The distribution percentages of branching angles were different among three modes, which indicated that Ph. edulis plastically responded to soil heterogeneity by changing branching angle. Continuous fertilization application(12-14 years)increased by 11.09% and 15.78% of total rhizome length respectively, when comparing SFH and MM to SH. The length of internodes and rhizome diameter were both not consistent with the change of rhizome severing and fertilization and soil heterogeneity in different management modes.However, significantly allometric functions were met by relating length of internodes or rhizome diameter to ramets diameter at breast height. More biomass was relatively allocated to the underground(such as rhizome)for SH which had one year fertilization, but this was adverse for SFH or MM that had long time fertilization(12-14 years).

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ZHU Qianggen, JIN Aiwu, CHEN Cao, WANG Yikun, HUANG Haiyong. The clonal architecture and biomass of Phyllostachys edulisas affected by different management modes[J]. Journal of Nanjing Forestry University (Natural Sciences Edition）. 2015, 39(01): 73-78 https://doi.org/10.3969/j.issn.1000-2006.2015.01.014

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